NEW YORK — Turns out, the only thing Mets manager Mickey Callaway lost this week was his voice.

Days after New York’s front office declared support for its criticized, second-year skipper, Callaway’s players rallied for another startling victory Thursday and a four-game sweep of the division-rival Nationals.

Carlos Gomez slipped out of his shoe during an early dash, then hit a go-ahead, three-run homer in the eighth inning that helped the Mets overcome a comeback that started after Washington manager Dave Martinez’s heated ejection for a 6-4 victory.

Gomez bolted around the bases, smacking himself in the helmet and letting out a few joyous shouts after his two-out shot against Wander Suero (1-4). Players jumped out of the dugout and danced on the warning track while he rounded the bases, greeting him with flying handshakes and hugs.

Callaway was already hoarse Thursday morning when he met with reporters. After Gomez’s stunner, he could hardly get his pipes working.

“Sorry for the voice,” he said. “I’ve been screaming and yelling (through) these crazy games.”

Gomez delivered his first homer of the season in his seventh game. The 13-year major league veteran opened the year with Triple-A Syracuse, hoping to extend his playing days at Citi Field after breaking into the majors with the Mets as a 21-year-old in 2007.

“I’m blessed,” Gomez said. “Came back here in this situation and play the way that we’re playing right now with a lot of energy, you know, I’m enjoying every single time. You guys can notice when I’m in the dugout or playing defense like a little kid. I’m enjoying every single moment.”

It was the third straight game New York beat Washington in its final turn at-bat.

The Nationals seemed as if they’d snapped from their funk after Martinez’s ejection in the eighth. Plate umpire Bruce Dreckman rang up Washington’s Howie Kendrick for a strikeout as he tried to check his swing leading off, then tossed the veteran infielder. Martinez charged from the dugout, spiked his hat and kicked dirt on home plate while barking relentlessly at Dreckman.

“I just didn’t think he swung,” Martinez said. “We just got into it. All I did was tell him to ask for help. That’s why the first base umpire is there. He didn’t like it.”

The Nationals have lost five straight and six of seven. Washington dropped to 19-31, a record better than only the Miami Marlins, Baltimore Orioles and Kansas City Royals.

Hardly the kind of start expected from an NL playoff hopeful.

“You can’t put a blame on one thing,” Martinez said when asked where culpability fell. “You really can’t. This is a team thing.”

The Mets swept the Nationals/Expos franchise over four games for the first time since July 1-4, 1991. It was the first four-game home sweep by New York in the series since May 15-18, 1972.

New York is 18-13 against the NL East and 24-25 overall. The Mets enter a three-game series against Detroit hoping to climb over .500 for the first time since May 2.

“Now we’re winning ballgames, there’s definitely a different air because of that,” Callaway said. “But these guys have not quit one time. They’re tremendous. That’s an unbelievable comeback right there.”

Starting with an unusual 12:10 p.m. first pitch, both teams looked short on caffeine. New York had two errors, Washington had one and both teams had players thrown out on the bases.

SHOE FLY DON’T BOTHER

Gomez stole second in the fifth inning and took third on catcher Gomes’ throwing error, and his left shoe flew off in the process. Gomez never broke stride and scored two batters later on Juan Lagares‘ sacrifice fly for a 1-0 lead.

IT’LL BE ALL RIGHT

New York placed infielders Robinson Cano (left quad strain) and Jeff McNeil (tight left hamstring) on the injured list prior to the game, leaving the team without two regular position players. The Mets went with an all right-handed lineup against a right-handed starting pitcher for the second time in franchise history, according to the Elias Sports Bureau.

TRAINER’S ROOM

Nationals: 1B Ryan Zimmerman (plantar fasciitis in right foot) has experienced some pain running in recent days and will back off. He was still expected to hit in a batting cage Thursday.

Mets: Luis Guillorme and Ryan O'Rourke were recalled from Triple-A Syracuse. … New York claimed former Phillies OF Aaron Altherr off waivers from San Francisco and designated RHP Tim Peterson for assignment.

UP NEXT

Nationals: Open a four-game home series against Miami with RHP Kyle McGowin (0-0, 6.00) set to make his second career start. RHP Pablo Lopez (3-5, 5.06) is up for the Marlins.

Susan Slusser of the San Francisco Chronicle reports that Oakland Athletics owner John Fisher has reversed course and will continue to pay minor leaguers. Fisher tells Slusser, “I concluded I made a mistake.” He said he is also setting up an assistance fund for furloughed employees.

The A’s decided in late May to stop paying paying minor leaguers as of June 1, which was the earliest date on which any club could do so after an MLB-wide agreement to pay minor leaguers through May 31 expired. In the event, the A’s were the only team to stop paying the $400/week stipends to players before the end of June. Some teams, notable the Royals and Twins, promised to keep the payments up through August 31, which is when the minor league season would’ve ended. The Washington Nationals decided to lop off $100 of the stipends last week but, after a day’s worth of blowback from the media and fans, reversed course themselves.

An @sfchronicle exclusive: A's owner John Fisher reverses course, apologizes: team will pay minor-leaguers; "I concluded I made a mistake," he tells me. He's also setting up an assistance fund for furloughed employees: https://t.co/8HUBkFAaBx)